Error Code 21 - Diagnosed Results.

[rnbguy]

Hi Guys,

My car is running fine but id love to get no error codes. Just because we can...

So im trying to fix this error code 21 (ignition system). Refering to the guide and performing its required tests here are my results... can anyone help me come to a clear conclusion?

This could be a good reference for future skyline riders who get this error.

Just Before i begin ive noticed in the skyline manual it says the ignitor harness should be 1,2,3,4,5,6,G ... however mine is 1,2,3,G,4,5,6 I hope thats normal in australian skylines or has the previous owner done something custom.

TEST ONE - Remove each connector to the coils/spark plugs to see if rev changes.

This test passed, all connectors made an impact to rpms.

TEST TWO - On the Ignitor harness check continuity between terminal E and Earth.

Passed.

TEST THREE - Test continuity between certain ecu terminals and ignitor connectors.

CONFUSED:::: Why are these results ended up this way, is this normal??Could this be a cause???

Check ECU terminal ->(conects to)-> Ignitor Terminal | RESULT: ECU TERMINAL ->(was actually connected to)-> Ignitor Terminal

1 -> 2 | 1 -> 1 (good connection)

12 ->2 | 12 -> 5 (good connection)

3 -> 3 | 3 -> 3 (good connection)

13 -> 4 | 13 -> 6 (good connection)

2 -> 5 | 2 -> 2 (good connection)

11 -> 6 | 11 -> 4 (good connection)

10 -> E | 10 -> E (flakey, connection wasnt showing 100% continuity)

20 -> E | 10 -> E (good connection)

CONCLUSION: ??

TEST FOUR: Check voltages of ecu terminals below with a group point on idle it is expected to be aprox 0.2V~0.3V.

Terminals: 1,2,3,11,12,13 all showed 0.07V~0.08V on idle.

Ive then also noted this wire loose which seems to be sticking out of the the connection leading to the furthest (from front of car) spark plug.

I also noticed the wire below (black/purlple) just loops,is that normal?:

So is anyone able to help on this one?

Edited March 7, 2009 by rnbguy

[T04GTR]

umm make sure the TPS signal is 0.4v at idle.. if its not adjust it.

[T04GTR]

woops. thought it was an atessa question. my bad

[rnbguy]

no probs i was confused where that came from =/

[nIsMo86]

The black wire with broken connector on the end is meant to be earthed. Crimp a new connector on the end and earth it to the rocker cover with a coil pack cover screw. The loop in the harness is used for checking timing and is normal.

Edited March 7, 2009 by nIsMo86

[rnbguy]

nice ill do it tonight, also out of curiousity is it normal those connectors on my ignitor dont match the values given by the guide...

[JonnoHR31]

Just Before i begin ive noticed in the skyline manual it says the ignitor harness should be 1,2,3,4,5,6,G ... however mine is 1,2,3,G,4,5,6 I hope thats normal in australian skylines or has the previous owner done something custom.

123456g is a rb 20 ignitor, 123g456 is a s1 rb25 ignitor

[rnbguy]

thanx for clearing that up, ive noticed a few typos in the manual because that pattern was written to be for a rb25det.... so why does the guide say ecu pin 1 (inj 1) is supposed to goto pin 2 on the ignitor (im guessing meaning cyl 2) when in mine actually ends up ecu 1 goes to ignitor 1?

and same with the rest mentioned above?

[cosmic starz]

do not forget that Code 21 can be an intermittent fault - at start, later it becomes somewhat permanent as the coil(s) breakdown more - so you may get good readings during testing even though you may be following correct procedure

if the coilpacks are oem Nissan and have done about 60k+ already you may as well just get new set of Splitfires and be done

[rnbguy]

do not forget that Code 21 can be an intermittent fault - at start, later it becomes somewhat permanent as the coil(s) breakdown more - so you may get good readings during testing even though you may be following correct procedure

if the coilpacks are oem Nissan and have done about 60k+ already you may as well just get new set of Splitfires and be done

thanx for the tips guys, grounding that black wire pictured above fixed the issue 21 from comming back up and at the same time fixed the not so well result above of the Earth to pin 10....

I'll still be curious why the ecu injectors are pointing to different points on the ignitor.